Transmission Structure and Access for a Radio System

1. A method comprising: receiving, by a wireless device, one or more messages comprising: a cell index of a cell; a plurality of configuration parameters of a channel occupancy time (COT) of the cell; and an indication of a position of a field, for the COT of the cell, within a downlink control information (DCI); receiving the DCI comprising a list of fields; determining a configuration parameter of the plurality of configuration parameters of the COT based on the field in the list of fields, wherein the field is identified in the list of fields based on the indication of the position of the field; and transmitting, via the cell, a transport block on uplink resources of the COT with the configuration parameter.

2. The method of claim 1 , wherein the configuration parameter indicates a length of the COT in terms of symbols.

3. The method of claim 1 , wherein the configuration parameter indicates a slot format combination.

4. The method of claim 3 , wherein a length of the slot format combination in the time domain is equal to a length of the COT in terms of symbols.

5. The method of claim 4 , wherein the symbols are orthogonal frequency division multiplexing symbols.

6. The method of claim 1 , wherein the plurality of configuration parameters comprises a plurality of slot format combinations.

7. The method of claim 1 , wherein the configuration parameter indicates a structure of the COT.

8. The method of claim 1 , wherein: the one or more messages further comprise a slot format indicator-radio network temporary identifier (SFI-RNTI); and the DCI is scrambled with the SFI-RNTI.

9. The method of claim 1 , wherein the receiving the DCI comprises receiving the DCI at the beginning of the COT.

10. The method of claim 1 , wherein the receiving the DCI comprises receiving the DCI at: multiple time domain positions in the COT; or multiple frequency domain positions in the COT.

11. A wireless device comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to: receive one or more messages comprising: a cell index of a cell; a plurality of configuration parameters of a channel occupancy time (COT) of the cell; and an indication of a position of a field, for the COT of the cell, within a downlink control information (DCI); receive the DCI comprising a list of fields; determine a configuration parameter of the plurality of configuration parameters of the COT based on the field in the list of fields, wherein the field is identified in the list of fields based on the indication of the position of the field; and transmit, via the cell, a transport block on uplink resources of the COT with the configuration parameter.

12. The wireless device of claim 11 , wherein the configuration parameter indicates a length of the COT in terms of symbols.

13. The wireless device of claim 11 , wherein the configuration parameter indicates a slot format combination.

14. The wireless device of claim 13 , wherein a length of the slot format combination in the time domain is equal to a length of the COT in terms of symbols.

15. The wireless device of claim 14 , wherein the symbols are orthogonal frequency division multiplexing symbols.

16. The wireless device of claim 11 , wherein the plurality of configuration parameters comprises a plurality of slot format combinations.

17. The wireless device of claim 11 , wherein the configuration parameter indicates a structure of the COT.

18. The wireless device of claim 11 , wherein: the one or more messages further comprise a slot format indicator-radio network temporary identifier (SFI-RNTI); and the DCI is scrambled with the SFI-RNTI.

19. The wireless device of claim 11 , wherein the DCI is received at the beginning of the COT.

20. The wireless device of claim 11 , wherein the DCI is received at one of: multiple time domain positions in the COT; or multiple frequency domain positions in the COT.